INSTALLATION, OPERATION, &
MAINTENANCE MANUAL
TITLE: F88 Series Safety Relief Valve Rev. D Page 4 of 15
2.0 DESCRIPTION, OPERATION, SERVICE ENVELOPE,
INSTALLATION, and STARTUP
2.1 DESCRIPTION / OPERATION
The FLOW SAFE F88 Series safety relief valve is a direct-acting spring-loaded relief valve, suitable for
gas or liquid service. The Type F88 is plastic-seated with a plastic seal.
Orifice sizes are available in -3, -4, -8, -G, and -J with set pressures as referenced in 2.2.
Blowdown is nonadjustable, designed to be approximately 20%. At low flow rates on liquids, the valve
tends to modulate and will reclose with this approximate blowdown value.